Hello,
The system freeze you experienced running
ESET Smart Security Home Edition 5 under
Microsoft Windows Link Removed due to 404 Error when hot-plugging USB mass storage devices is a known issue, and for now, the recommended course of action is to stay on
ESET Smart Security Home Edition 4.2, which can be downloaded directly from ESET's servers at:
http://download.eset.com/download/win/v4ess/ess_nt32_enu.msi
A fix for the issue is currently being tested in the beta test version of
ESET Endpoint Security Suite (which used to be
ESET Smart Security Business Edition). If you would like to download a copy of that to try the fix, it is available from ESET's beta test portal at:
http://www.eset.com/us/beta/endpoint/
I'm sorry to hear you had a bad experience with ESET Smart Security on your Thinkpad T42 and hope you will let us know if the new beta build resolves the issue for you.
Regards,
Aryeh Goretsky